/usr/share/guile/1.8/lang/elisp/primitives/syntax.scm is in guile-1.8-libs 1.8.8+1-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 | (define-module (lang elisp primitives syntax)
#:use-module (lang elisp internals evaluation)
#:use-module (lang elisp internals fset)
#:use-module (lang elisp internals lambda)
#:use-module (lang elisp internals set)
#:use-module (lang elisp internals trace)
#:use-module (lang elisp transform))
;;; Define Emacs Lisp special forms as macros. This is more flexible
;;; than handling them specially in the translator: allows them to be
;;; redefined, and hopefully allows better source location tracking.
;;; {Variables}
(define (setq exp env)
(cons begin
(let loop ((sets (cdr exp)))
(if (null? sets)
'()
(cons `(,set (,quote ,(car sets)) ,(transformer (cadr sets)))
(loop (cddr sets)))))))
(fset 'setq
(procedure->memoizing-macro setq))
(fset 'defvar
(procedure->memoizing-macro
(lambda (exp env)
(trc 'defvar (cadr exp))
(if (null? (cddr exp))
`(,quote ,(cadr exp))
`(,begin (,if (,not (,defined? (,quote ,(cadr exp))))
,(setq (list (car exp) (cadr exp) (caddr exp)) env))
(,quote ,(cadr exp)))))))
(fset 'defconst
(procedure->memoizing-macro
(lambda (exp env)
(trc 'defconst (cadr exp))
`(,begin ,(setq (list (car exp) (cadr exp) (caddr exp)) env)
(,quote ,(cadr exp))))))
;;; {lambda, function and macro definitions}
(fset 'lambda
(procedure->memoizing-macro
(lambda (exp env)
(transform-lambda/interactive exp '<elisp-lambda>))))
(fset 'defun
(procedure->memoizing-macro
(lambda (exp env)
(trc 'defun (cadr exp))
`(,begin (,fset (,quote ,(cadr exp))
,(transform-lambda/interactive (cdr exp)
(symbol-append '<elisp-defun:
(cadr exp)
'>)))
(,quote ,(cadr exp))))))
(fset 'interactive
(procedure->memoizing-macro
(lambda (exp env)
(fluid-set! interactive-spec exp)
#f)))
(fset 'defmacro
(procedure->memoizing-macro
(lambda (exp env)
(trc 'defmacro (cadr exp))
(call-with-values (lambda () (parse-formals (caddr exp)))
(lambda (required optional rest)
(let ((num-required (length required))
(num-optional (length optional)))
`(,begin (,fset (,quote ,(cadr exp))
(,procedure->memoizing-macro
(,lambda (exp1 env1)
(,trc (,quote using) (,quote ,(cadr exp)))
(,let* ((%--args (,cdr exp1))
(%--num-args (,length %--args)))
(,cond ((,< %--num-args ,num-required)
(,error "Wrong number of args (not enough required args)"))
,@(if rest
'()
`(((,> %--num-args ,(+ num-required num-optional))
(,error "Wrong number of args (too many args)"))))
(else (,transformer
(, @bind ,(append (map (lambda (i)
(list (list-ref required i)
`(,list-ref %--args ,i)))
(iota num-required))
(map (lambda (i)
(let ((i+nr (+ i num-required)))
(list (list-ref optional i)
`(,if (,> %--num-args ,i+nr)
(,list-ref %--args ,i+nr)
,%nil))))
(iota num-optional))
(if rest
(list (list rest
`(,if (,> %--num-args
,(+ num-required
num-optional))
(,list-tail %--args
,(+ num-required
num-optional))
,%nil)))
'()))
,@(map transformer (cdddr exp)))))))))))))))))
;;; {Sequencing}
(fset 'progn
(procedure->memoizing-macro
(lambda (exp env)
`(,begin ,@(map transformer (cdr exp))))))
(fset 'prog1
(procedure->memoizing-macro
(lambda (exp env)
`(,let ((%--res1 ,(transformer (cadr exp))))
,@(map transformer (cddr exp))
%--res1))))
(fset 'prog2
(procedure->memoizing-macro
(lambda (exp env)
`(,begin ,(transformer (cadr exp))
(,let ((%--res2 ,(transformer (caddr exp))))
,@(map transformer (cdddr exp))
%--res2)))))
;;; {Conditionals}
(fset 'if
(procedure->memoizing-macro
(lambda (exp env)
(let ((else-case (cdddr exp)))
(cond ((null? else-case)
`(,nil-cond ,(transformer (cadr exp)) ,(transformer (caddr exp)) ,%nil))
((null? (cdr else-case))
`(,nil-cond ,(transformer (cadr exp))
,(transformer (caddr exp))
,(transformer (car else-case))))
(else
`(,nil-cond ,(transformer (cadr exp))
,(transformer (caddr exp))
(,begin ,@(map transformer else-case)))))))))
(fset 'and
(procedure->memoizing-macro
(lambda (exp env)
(cond ((null? (cdr exp)) #t)
((null? (cddr exp)) (transformer (cadr exp)))
(else
(cons nil-cond
(let loop ((args (cdr exp)))
(if (null? (cdr args))
(list (transformer (car args)))
(cons (list not (transformer (car args)))
(cons %nil
(loop (cdr args))))))))))))
;;; NIL-COND expressions have the form:
;;;
;;; (nil-cond COND VAL COND VAL ... ELSEVAL)
;;;
;;; The CONDs are evaluated in order until one of them returns true
;;; (in the Elisp sense, so not including empty lists). If a COND
;;; returns true, its corresponding VAL is evaluated and returned,
;;; except if that VAL is the unspecified value, in which case the
;;; result of evaluating the COND is returned. If none of the COND's
;;; returns true, ELSEVAL is evaluated and its value returned.
(define <-- *unspecified*)
(fset 'or
(procedure->memoizing-macro
(lambda (exp env)
(cond ((null? (cdr exp)) %nil)
((null? (cddr exp)) (transformer (cadr exp)))
(else
(cons nil-cond
(let loop ((args (cdr exp)))
(if (null? (cdr args))
(list (transformer (car args)))
(cons (transformer (car args))
(cons <--
(loop (cdr args))))))))))))
(fset 'cond
(procedure->memoizing-macro
(lambda (exp env)
(if (null? (cdr exp))
%nil
(cons
nil-cond
(let loop ((clauses (cdr exp)))
(if (null? clauses)
(list %nil)
(let ((clause (car clauses)))
(if (eq? (car clause) #t)
(cond ((null? (cdr clause)) (list #t))
((null? (cddr clause))
(list (transformer (cadr clause))))
(else `((,begin ,@(map transformer (cdr clause))))))
(cons (transformer (car clause))
(cons (cond ((null? (cdr clause)) <--)
((null? (cddr clause))
(transformer (cadr clause)))
(else
`(,begin ,@(map transformer (cdr clause)))))
(loop (cdr clauses)))))))))))))
(fset 'while
(procedure->memoizing-macro
(lambda (exp env)
`((,letrec ((%--while (,lambda ()
(,nil-cond ,(transformer (cadr exp))
(,begin ,@(map transformer (cddr exp))
(%--while))
,%nil))))
%--while)))))
;;; {Local binding}
(fset 'let
(procedure->memoizing-macro
(lambda (exp env)
`(, @bind ,(map (lambda (binding)
(trc 'let binding)
(if (pair? binding)
`(,(car binding) ,(transformer (cadr binding)))
`(,binding ,%nil)))
(cadr exp))
,@(map transformer (cddr exp))))))
(fset 'let*
(procedure->memoizing-macro
(lambda (exp env)
(if (null? (cadr exp))
`(,begin ,@(map transformer (cddr exp)))
(car (let loop ((bindings (cadr exp)))
(if (null? bindings)
(map transformer (cddr exp))
`((, @bind (,(let ((binding (car bindings)))
(if (pair? binding)
`(,(car binding) ,(transformer (cadr binding)))
`(,binding ,%nil))))
,@(loop (cdr bindings)))))))))))
;;; {Exception handling}
(fset 'unwind-protect
(procedure->memoizing-macro
(lambda (exp env)
(trc 'unwind-protect (cadr exp))
`(,let ((%--throw-args #f))
(,catch #t
(,lambda ()
,(transformer (cadr exp)))
(,lambda args
(,set! %--throw-args args)))
,@(map transformer (cddr exp))
(,if %--throw-args
(,apply ,throw %--throw-args))))))
|